It's gonna be a no-go on this ghosting project. The client is dead-set on a "partnership," which pretty much translates into him thinking he can find a writer who will dedicate three solid months to produce a proposal and full manuscript with only a promised 30 percent split of the expected royalties (for the book and movie he says will happen) as payment.
Sorry, dude. I might be kicking myself later if Brad Pitt leads an all-star cast in the blockbuster, but I have a mortgage that ain't gonna get paid on a promise.